Thread-cutter.



y originar eminente eier september io, 191e, semi no.

fiililii@ i union.

OMAR A. EWHEELEJR., F PORTLAND', OREG-0N, SSIGNOR, .'BY`DIRECT AND MESNE" SSGNMENTS, TO WHEELER AUTOMATIC MACHINE C0., A CORPORATION OF Specification of Letters Patent.

THREAD-corren..

Patented Sept. 5, 1916.

719,656. Divided anu this application tiled September 11, 1913, Serial No. M9292. Renewed February 11, 1916. Serial No. 77,806.

To all 'whom it may concern .1

Be it known that il, @MAR A. WHEELER, a/citizen out' the United States, residing atA Portland, in 'the county of Multnomah and State of Gregori, have invented certain new andusei'ul. Improvements in Thread-Cut ters, of which the following is a specilicatiene The present invention relates to thread. cutters, and has for its object to providea 'thread cutter adapted for use upon sewing machines and which will automatically grasp and sever the thread at predetermined intervals.

The subject matter of the invention was divided out of my application No.y 719,656 for automatic sewing machines, iiled Septomber 10, 1912. K

rihe object sought by this invention is accomplished hy means oli-the structure shown in the accompanying dYawing-in which- Figure 1 is a plan view of the needle plate and thread cutting mechanism, showing connections with the operative parts. Fig. 2 is e. perspective elevational View showing the needle plate and cutting jaw. Fig. 3 is an end View showing the thread cutter, with needle in operative position. Fig. 4 is a iront elevation of Fig.. 1.

Describing the drawing in detail, 1 represents a table or support, to which a hase member 6 carrying the thread cutter, is se cured. Rising from the hasey at each side,

is a stud 1 on the upper ends of which is carried a needle piate 3 which projects to 'the rear of the studs. ln the longitudinal center of the upper tace oit this plate is .termed a groove 2 in the median portion oir' which is a converging slot 3 leading to a central aperture ft adapted to receive the needle de.

In the upper ends of the studs arc journale-d the hollow shafts 2 und 2f rcspectively, the latter being provided w1th a tongue 7 which engages in the slot 5 1n the former. A holt 2" passes through said shafts, and by means of the nut lll adjustahly holds them in position. On the outer portion of each shaft is formed an urm 8 which has at its outer end a. right angularly formed cutting jaw 9, rising slightly to the rear ot thc Je fr; and depending from the rear ci i said arm, is an arni 8, to one et which. is piveted upon the pin 12a the forwardly. projecting bar 13. Intermediate each of the jaws 9 and its respective end of the needle plate is an oppositely disposed coacting jaw 10, pivotally secured to the angular portion of the jaw 9 upon the pin 12. Extending rearwardly from the lower end of each of said jaws 10 is an arm 10b having in its end a slot 10 each ada ted to engage over its respective pin 11 xed in the end of the needle plate, approxi mately in a horizontal plane with the hollow A shafts, so that the jaws will stand open when 1n down position. By means of this structure, any oscillation of the arm 8a will 'produce a corresponding movement in the arm 8,which will cause each pair of jaws `to rise above its respective en d of the needle plate, one member of each pair rising at each side of the thread groove 23; and in this upward movement the jaws will swing the thread will extend rearwardly from the i so that a pair of shears will be positioned at the rear end thereof in position to receive and cut the thread at the limit of its travel, after the article hein sewed has moved past the edge of the needl being adapted for use upon a power driven machine is provided with means whereby it may he mechanically operated. .To this end l have provided a rightangled lever 16, pivotally secured upon the table 1 by means of lscrew 15 through the terminal of one arm. Extending from' the angular portion of the lever, in line with said pivoted arm, is a projection carrying a journal 20, upon which is mountedV the outer end of har 13. Within a slot 19 in the lower portion ot said extension is secured a. spring 21 the outer end of which bears against the stop 2d fixed in the table 1. In the extremity of the other arm of said lever 16 is mounted a roller 17 against which bears the beveled surface of the arm 18, which is carried by e plate. l This device frame or otherwise suitably the shifting of the lever the the machine actuated. By bar 13 will be jaws to rise and close upon the thread above them. After the arm 18 passes the roll 17, the spring 21 will restore the lever 16 and consequently return' the jaws to their lower limit. By constructing the hollow shaft in sections it is possible to adjust them upon the jaws and thus hold the latter at the desired degree of tension. I

Having now described my invention, what l claim irsl. ln a sewing machine, comprising a base plate, studs rising therefrom, a needle plate disposed parallel with the base at the upper ends of the studs, a rock shaft mounted in said studs, a bell crank having one member oi a pair of shears standing upright from the terminal of one arm. thereot adjacent the needle plate fixed upon each end of said shaft, a coaeting jaw pivetally secured to each of the irst mentioned jaws, and means for preserving it in working relation thereto, as the former is a thread @utter vshil'ted with the roeking'of said shaft.

` thread cuttery 2. ln a sewing machine, a comprising a base plate, studs rising` theretrom, a needle plate disposed parallel with thrust forward, Causing the menare the base at the upper ends the studs, a rock shaft mounted in said studs, a bell crank having one membej of a pair of shears standing uprightjfrom the terminal of one arm thereof` adjacent the needle plate fixed upon each end of said shaft, a coact-Y ing jaw pivotally secured to each of the irst mentioned jaws, means for preserving it in working relation thereto, as the former is shifted with the rocking of said shaft, and means for longitudinally adjusting said ,Graft to adjust jaws to each other.

3. In a sewing machine, a thread cutter eoniprlsing a base, studs rising needle plate disposed parallel with the base at the upper ends of the studs, a rock-shaft mounted in saidjstuds, a pair ot' shears earried vin upi-iglit'fposition by said shaft at the edge oi said needle plate, and means vior preserif'ing the members of saidcshears in working relation as they are operated by the rocking ol' said shaft. j

ln testimony whereof l affix my signature in the presence of two witnesses. f @MALE A. VVHEE'LER.

`Witnesses 'l E. EARL Finne, Hazen A. 'ARMsfrRobNd the members of each pair of therefrom, ai 

